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We consider the effect of nonmagnetic impurities on the onset temperature T* for the d-wave pairing in spin-fluctuation scenario for the cuprates. We analyze intermediate coupling regime when the magnetic correlation length xi/a>1 and the dimensionless coupling u is O(1). In the clean limit, T*approximate to 0.02v(f)/a in this parameter range and weakly depends on xi and u. We found numerically that this universal pairing scale is also quite robust with respect to impurities: the scattering rate Gamma(cr) needed to bring T* down to zero is about four times larger than in weak coupling, in good quantitative agreement with experiments. We provide analytical reasoning for this result.

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en

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American Physical Society

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This work is archived in the Texas A&M Digital Repository with the express permission of the rights holder (commonly but not always the publisher). A copy of the permission document is on file with the Texas A&M University Libraries.

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2-DIMENSIONAL HUBBARD-MODEL

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ANISOTROPIC SUPERCONDUCTORS

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STATES

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TEMPERATURE

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SUPPRESSION

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SCATTERING

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Physics

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dc.title

Reduced effect of impurities on the universal pairing scale in the cuprates